Spin chirality induced skew scattering and anomalous Hall effect in chiral magnets

Abstract

A new mechanism of skew scattering and anomalous Hall effect due to the spin chirality fluctuation is proposed theoretically.

First Demonstration of Magnetoelectric Coupling in a Polynuclear Molecular Nanomagnet: Single‐Crystal EPR Studies of [Fe3O(O2CPh)6(py)3]ClO4⋅py under Static Electric Fields

“…In addition, those objects possess a rare quantum property, spin chirality, which derives from the simultaneous interplay of competing antiferromagnetic interactions and Dzyaloshinskii–Moriya interactions (DMI). Spin chirality has generated interest as it relates to diverse phenomena, such as orbital currents in Mott insulators, toroidal magnetic moments in Dy III 3 triangles, Berry phase in spin triangles, magnetic skyrmions and anomalous Hall effect in chiral magnets …”

“…Spin chiralityh as generated interesta si tr elates to diversep henomena, such as orbital currents in Mott insulators, [2] toroidal magnetic moments in Dy III 3 triangles, [3] Berry phase in spin triangles, [4] magnetic skyrmions [5] and anomalous Hall effect in chiral magnets. [6] The scalar spin chirality in spin triangles has recently been proposed for the implementationo fs pin-chirality qubits,u tilizing the eigenvalue of their spin chirality operator as ac omputationald egree of freedom,i nstead of their spin projection. This encoding scheme, initially proposed for molecular nanomagnets( MNMs) [7,8] and then extended to clusters of atomic Cu [9] and quantum dot triads, [10] promises electric control, [7,8] practicallyz ero decoherence from hyperfine interactions, [11] and even the possibility of quaternary logic.…”

Helical magnetic structure and the anomalous and topological Hall effects in epitaxial B20 Fe1−yCoyGe films

“…(16), that stem from the finite chirality of the magnetization and can be very sensitive to the details of disorder in the samples (see, e.g., Ref. [83]); (iii) grain boundary scattering at the boundaries of the chiral grains playing some role when the helix pitch is large compared to the lateral grain size; or (iv) the presence of exotic chiral spin textures in experiments which deviate significantly in their shape and properties from conventional skyrmions, which were taken as the foundation for the analysis of transport properties observed here. For example, there are a number of recent studies reporting the observation of so-called chiral bobbers [84,85] whose key feature is the presence of a singular Bloch point [86], and which could in principle exhibit transport properties radically different from those stemming from the adiabatic description.…”

Impurity-induced vector spin chirality and anomalous Hall effect in ferromagnetic metals

“…We show the correlation between the vector spin chirality and the impurity is essential for the AHE. Due to these features, this mechanism is possible in ferromagnetic metals on centrosymmetric metals, unlike the scalar spin chirality mechanism [37,38,40]. These results suggest that the vector-chirality-induced AHE may exists universally in the ferromagnetic metals.…”

“…This contribution includes terms proportional to J K 3 , VJ K 2 , V J K 2 , and V 3 . The J K 3 term is already studied in preceding theoretical works [37,38]; the anomalous Hall effect appears when the thermal average of scalar spin chirality S S S i j ĺ · is finite, such as in chiral spin glass [37,39] and in chiral magnets [38].…”